I just installed 13.04 from (12.10) graphics are great except the dropdown folder feature is gone.There was no preview about what changes there are and I thought is was a software update..like of the ones that appear when opening firefox. now there is now feature in the help menu for new features. I also cannot find anything online.
Help, I am afraid I SHOULD NOT have installed the upgrade.

1 Answer
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Open Terminal; by lsb_release you can check your Ubuntu version. the other way at the right-top corner of the screen open 'corg' and select About this Computer. You will see your ubutu release version.